You are not understanding the term bobweight! It is not just the total weights of all the components.

Correctly, you weigh the big end with beam level and the small end supported, then you weigh the little end, beam level and big end supported.

Bobweight for one cylinder equals the weight of the big end plus rod bearing, plus one half of the weight of small end, pin, rings and piston.

As there are two rods per journal, the bobweight for a journal is 2 times the big end plus rod bearings, plus the weight of one rod small end, one piston, one pin and one set of rings. You can see that changing one gram on one end isn't the same as changing one gram on the other.

To answer your question about pins, I have no doubt that the lighter pin would be fine in your setup. Decades ago a friend was drag racing a 427 Chevy engine and used 0.088" wall thickness pins to offset some of the weight of the heavy TRW pistons. He used to twist that engine pretty tight, more than 8,000 rpm. There was never a problem with the pins. I believe some of the reason was the rigidity of the TRW clubs, but nonetheless that was quite a bit more severe than your pins are going to see.

R.